hi,
First of all, do not panic, lots of literature is available. Go through Book "Antenna Theory: Analysis and Design" by Belanis. Its good for beginners.
You can also look at these papers
1. "Comparison between Inset and Coaxial Feed Excitation Technique of Micro strip Antenna”, Proceedings of Conference on Information Science, Technology and Management (CISTM 2007), Hyderabad, India. 2007, July 16-18
2. "Design of Coaxial Fed Microstrip Antenna for LEO Satellites"
Hope it helps.